152 



ILLINOIS STATE ACADEMY OF SCIENCE 



increase in inherited power. The trotting power which 

 had no previous existence in the breed had its origin 

 somewhere among these animals. It could not come from 

 the environment because trotting power is something 

 which does not exist in the environment. 



[15] 



Jay-Eye-See. . 

 Born 1878 



[13] 



[14] 



r Dictator 



Born 1863 

 [15] 



[26] 

 Hambletonlan. . . . 

 Born 1849 



[16] 



Born 1848 

 L Clara. . 



[11] 



[17] 



[21] 

 Born 1865 



Midnight 



[7] 



Pilot, Jr. 

 Born 1844 



[18] 



[19] 



Born 1858 

 "-Twilight 



[8] 



[8] 

 Pedigree of the First 2.10 Trotter. 



Abdallah 

 Born 1823 



Born 1833 

 Kent Mare 



' American Star 

 Born 1837 



Born 1831 

 _ McKinstry Mare 



f Canadian Pilot 

 Born 1826 



Born 1825 

 Nancy Pope 



Lexington 

 Born 1850 



Born 1850 

 Daylight 



The figures in brackets between parents and off- 

 spring are Lamarck's factor of " length of time". Thus, 

 there are 15 years between the birth of Dictator and the 

 birth of his son Jay-Eye-See. These figures mean 

 nothing of themselves, but we begin to see a significance 

 when we compare them with the average age of parents 

 in normal breeding, which is 10.4 years for sires and 

 about 8.5 years for dams. As sires less than 7 years of 

 age are as common in normal breeding as are sires more 

 than 14, it will be seen that for the parents in all of the 

 generations in this pedigree, Lamarck's factor for 

 " length of time" is high. 



There is a life history of nearly all of the animals in 

 this pedigree, and from this history we can determine, 

 approximately, Lamarck's factor of activity, and hence 

 can determine whether there was a gain in the parents by 

 "frequent and continuous" exercise before reproduction, 



